A. Çelik


1 The Effect of Perceived Organizational Support on Organizational Identification

Authors: A. Çelik, M. Findik


The aim of the study is to determine the effects of perceived organizational support on organizational identification. In accordance with this purpose was applied on 131 family physicians in Konya. The data obtained by means of the survey method were analyzed. According to the results of correlation analysis, while positive relationship between perceived organizational support, organizational identification and supervisor support was revealed. Also, with the scope of the research, relationships between these variables and certain demographic variables were detected. According to difference analysis results of the research, significant differences between organizational identification and gender variable were determined. However, significant differences were not determined between demographic variables and perceived organizational support.

Keywords: perceived organizational support, family physicians, organizational identification, supervisor support

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2 Comparison of Tribological Properties of TiO₂, ZrO₂ and TiO₂–ZrO₂ Composite Films Prepared by Sol–Gel Method

Authors: A. Çelik, O. Çomaklı, M. Yazıcı, T. Yetim, A. F. Yetim


In this study, TiO₂, ZrO₂, and TiO₂–ZrO₂ composite films were coated on Cp-Ti substrates by sol-gel method. Structures of uncoated and coated samples were investigated by X-ray diffraction and SEM. XRD data identified anatase phase in TiO₂ coated samples and tetragonal zirconia phase in ZrO₂ coated samples while both of anatase and tetragonal zirconia phases in TiO₂–ZrO₂ composite films. The mechanical and wear properties of samples were investigated using micro hardness, pin-on-disk tribotester, and 3D profilometer. The best wear resistance was obtained from TiO₂–ZrO₂ composite films. This can be attributed to their high surface hardness, low surface roughness and high thickness of the film.

Keywords: Wear, TiO2, sol-gel, composite films, ZrO2, TiO₂–ZrO₂

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1 Comparison of Structure and Corrosion Properties of Titanium Oxide Films Prepared by Thermal Oxidation, DC Plasma Oxidation, and by the Sol-Gel

Authors: A. Çelik, O. Çomaklı, M. Yazıcı, T. Yetim, A. F. Yetim


In this work, TiO₂ films were deposited on Cp-Ti substrates by thermal oxidation, DC plasma oxidation, and by the sol-gel method. Microstructures of uncoated and TiO₂ film coated samples were examined by X-ray diffraction and SEM. Thin oxide film consisting of anatase (A) and rutile (R) TiO₂ structures was observed on the surface of CP-Ti by under three different treatments. Also, the more intense anatase and rutile peaks appeared at samples plasma oxidized at 700˚C. The thicknesses of films were about 1.8 μm at the TiO₂ film coated samples by sol-gel and about 2.7 μm at thermal oxidated samples, while it was measured as 3.9 μm at the plasma oxidated samples. Electrochemical corrosion behaviour of uncoated and coated specimens was mainly carried out by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in simulated body fluid (SBF) solution. Results showed that at the plasma oxidated samples exhibited a better resistance property to corrosion than that of other treatments.

Keywords: TiO2, sol-gel, CP-Ti, corrosion properties, thermal oxidation, plasma oxidation

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